Pd-catalyzed route to (±)-podophyllotoxin skeleton. Synthesis of the aryltetralin derivative
摘要:
A new Pd-catalyzed route to (+/-)-podophyllotoxin is disclosed, The strategy is based on an efficient organoaqueous reaction that diastereoselectivity introduces the C-4 hydroxyl group and the furan ring. Further functionalization led to all iododerivative. which was cyclized under optimized conditions either to the aryltetralin of (+/-)-podophyllotoxin or to a five-membered ring isomer. (C) 2002 Elsevier Science Ltd. All rights reserved.
Asymmetric Au-catalyzed domino cyclization/nucleophile addition reactions of enynes in the presence of water, methanol and electron-rich aromatic derivatives
作者:Alexandre Pradal、Chung-Meng Chao、Maxime R. Vitale、Patrick Y. Toullec、Véronique Michelet
DOI:10.1016/j.tet.2011.03.071
日期:2011.6
system is described for the asymmetric domino cyclization/functionalization reactions of functionalized 1,6-enynes in the presence of an external nucleophile. The use of (R)-4-MeO-3,5-(t-Bu)2-MeOBIHEP ligand associated with gold led to clean rearrangements implying the formal addition of an oxygen or carbon nucleophile to an alkene followed by a cyclization process. The enantiomeric excesses were highly
Cycloisomerization of 1,6-enynes in organoaqueous medium: an efficient and eco-friendly access to furan derivatives. Synthesis of a key intermediate of podophyllotoxin
The first cycloisomerization of enynes catalyzed by Pd(TPPTS)(3) catalyst in aqueous medium to give functionalized furans is described. This new reaction has been applied to the synthesis of podophyllotoxin analog. (C) 2001 Elsevier Science Ltd. All rights reserved.
Towards asymmetric Au-catalyzed hydroxy- and alkoxycyclization of 1,6-enynes
作者:Chung-Meng Chao、Emilie Genin、Patrick Y. Toullec、Jean-Pierre Genêt、Véronique Michelet
DOI:10.1016/j.jorganchem.2008.08.008
日期:2009.2
The efficiency of a Au(III)/chiral ligand system has been studied. The association of several chiral mono- and bidentate phosphanes with gold has been tested in the formal addition of an oxygen nucleophile to an alkene followed by a cyclization process, namely the hydroxycyclization reaction of 1,6-enynes. The use of ( R)-4-MeO-3,5-(t-Bu)(2)-MeOBIPHEP ligand led to clean cycloisomerizations and afforded the highest enantiomeric excesses. The enantiomeric excesses were highly dependant on the substrate/nucleophile combination. A P-31 NMR study of the catalytic species tends to prove that Au( III) catalyst may be reduced to Au( I) intermediate in the presence of phosphanes. (C) 2008 Elsevier B.V. All rights reserved.
Gold-Catalyzed Hydroxy- and Alkoxycyclization of Functionalized Enynes
A general Au III catalytic system is described for the efficient hydroxy- and alkoxycyclization reactions of 1,6-enynes. The reactions lead to carbo- and heterocyclic alcohols or ethers in good to excellent yields. The cyclizations are conducted in the presence of AuCl 3 /AgSbF 6 /PPh 3 catalyst in dioxane-water or various alcohols at room temperature. The hydroxycyclization reactions of 1,7-enynes
描述了一种通用的 Au III 催化系统,用于 1,6-烯炔的有效羟基和烷氧基环化反应。该反应导致碳和杂环醇或醚的产率良好至极好。在AuCl 3 /AgSbF 6 /PPh 3 催化剂的存在下,在二恶烷-水或各种醇中在室温下进行环化。1,7-烯炔的羟基环化反应得到甲基酮或甲基酮和碳环醇的混合物。
Pd-catalyzed route to (±)-podophyllotoxin skeleton. Synthesis of the aryltetralin derivative
A new Pd-catalyzed route to (+/-)-podophyllotoxin is disclosed, The strategy is based on an efficient organoaqueous reaction that diastereoselectivity introduces the C-4 hydroxyl group and the furan ring. Further functionalization led to all iododerivative. which was cyclized under optimized conditions either to the aryltetralin of (+/-)-podophyllotoxin or to a five-membered ring isomer. (C) 2002 Elsevier Science Ltd. All rights reserved.